Expression of caspase-3 in Caco-2 cells in the co-culture system. Protein expression was detected by Western blotting. Data are presented as mean ± SEM. (*, P<0.05 vs. RAW264.7 cells + Caco-2 group; #, P<0.05 vs. LPS + IFN-γ group). SEM, standard error of the mean; LPS, lipopolysaccharide; SR-A1, A1 scavenger receptor.